Japan's exports pick-up steam in April

Japan's exports rose 5.1 percent in April from a year earlier, above analyst forecasts in a Reuters poll for a 4.8 percent rise, data on Wednesday showed.

Imports rose an annual 3.4 percent versus forecasts for a 0.8 percent rise, while the trade balance stood at a deficit of 808.9 billion yen ($7.98 billion), much larger than expectations for a 646 billion yen deficit.

Japan's trade balance has been in a deficit for 22 months in a row now.

"The data was not really a surprise at all. They [Japan's policy makers] were hoping for a lower yen to stimulate exports and a lower yen just isn't coming," said Boris Schlossberg, managing director at BK Asset Management.

Kiyoshi Ota | Bloomberg | Getty Images

Trucks bound for bound for shipment sit parked at a port in Yokohama, Kanagawa Prefecture, Japan.

"The problem is that the unbelievable decline in U.S. rates that has kept dollar-yen much lower than what everybody thought. It's frustrating all the plans of [BOJ Governor Haruhiko] Kuroda and [Prime Minister] Shinzo Abe to stimulate the economy," he said.

The Bank of Japan ends a two-day meeting on Wednesday and is expected to maintain its current monetary policy, under which it plans to increase Japan's base money by 60-70 trillion yen ($589-$688 billion) a year via aggressive asset purchases.

"The Bank of Japan hasn't done enough. They need to do at least a 100 trillion yen to drive dollar-yen to 105 and stimulate the economy," Schlossberg added.